Brocock/BRK Transfer Port data for Sniper XR

[Jimmyjam]

Hello, I'm new to PCP rifles and AGN. I recently bought a barely used Brocock Compatto Sniper XR in .22 with Huma reg. So far it has impressed me.

I don't have a chrono yet and have been searching the forums for TP/ Power switch velocity data but haven't found data for a similar model. If I understand correctly, the Sniper XR series ( except mag or 12fpe versions) are pretty much the same, as far as power, design and tuning from factory?

My Compatto has 17" bbl and the TP / power switch has 4 positions.

I was hoping someone might have time to share any velocity data or accuracy experience they have for this rifle using common .22 Pellets. I've been using JSB Jumbo 15.89gr and Jumbo RS 13.43gr with great results.

I'm primarily doing backyard pest control at 60yds or less.

Thank you for reading

 

[L.Leon]

Thanks for looking out for me. 7 fps es is the max I will accept, even for my springers. The sniper usually runs about 5.

Are you looking at the images you posted? You largest ES was a whooping 262 fps, then 252 fps, down to 115? Your Sniper in the info you provided, shows a sensible ES of 5 FPS, in just one instance. in the low power TP setting. The other triple digit ES numbers? Are ridiculously off…

 

[L.Leon]

Here are some number from my Sniper HR, note the SD and ES numbers…

 

[PEP3]

Here are some number from my Sniper HR, note the SD and ES numbers…
View attachment 519165

Maybe if I explain what I was doing it would make more sense

 

[L.Leon]

The explanation of the 3 different TP levels as you now illustrate makes more sense. As presented originally? Thanks for taking the time to clarify…

 

[Jimmyjam]

Yes, sorry I’ve been away for a couple of days. Those shot strings are different power levels. Most are 4 shots on each level. Only used power level 3 on one as it’s so close to P4. My sniper is perfect, no issues and stacks them out to 50 yards.

I can understand now. Just ignore the spread data on the mix TP setting charts. Thanks for the clarification and the data!

 

[Jimmyjam]

Hey, if you’re happy… Though the numbers you posted… Yikes!

Most of his data sheets are using mixed data for the different TP settings so the spread data line is not valid. After looking at it with that in mind you can see the different groups.

 

[Jimmyjam]

If you look at the data for "low power" sheet all the shots were at one TP setting and looks very good!

Thanks again to you guys for helping me out